ATSAM4SD16BA-MU - 120MHz Cortex-M4 MCU 1MB Flash 64-QFN | Microchip
MPN: ATSAM4SD16BA-MU ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $6.49 | $6.49 |
| 10 | $5.85 | $58.50 |
| 100 | $5.21 | $521.00 |
| 500 | $4.66 | $2,330.00 |
| 1,000 | $4.12 | $4,120.00 |
ATSAM4SD16BA-MU Overview
An ARM Cortex-M4 microcontroller is a 32-bit RISC processor core (developed by Arm Holdings) optimized for embedded applications that demand deterministic real-time response, low power consumption, and rich connectivity. The Cortex-M4 sits inside a layered taxonomy: ARM core -> Cortex-M4 -> Cortex-M family -> 32-bit MCU -> microcontroller -> semiconductor. It adds a DSP instruction set and single-precision FPU on top of the Thumb-2 ISA, giving it a position above Cortex-M0/M3/M0+ in computational capability while preserving deterministic interrupt latency.
Key features of the ATSAM4SD16BA-MU include a 2 Kbyte instruction cache, Memory Protection Unit (MPU), DSP instruction set, and Thumb-2 ISA. The SAM4S multi-layer bus matrix, multi-channel DMA, and distributed memory architecture support high data-rate communication peripherals including USB Full-Speed, CAN, USART, SPI, TWI (I2C), and SSC/I2S interfaces. Static and dynamic power-control modes including Sleep, Wait, and Backup reduce quiescent current for battery-powered designs.
The device features a multi-layer AHB bus matrix that allows parallel access between the Cortex-M4 core, the Flash controller, the SRAM banks, and the peripheral DMA channels, eliminating contention and supporting simultaneous peripheral transfers. The integrated Flash accelerator with prefetch buffer and branch cache delivers near-zero-wait-state performance at 120MHz from the embedded Flash array, eliminating the need for external memory in most designs.
Typical applications for the ATSAM4SD16BA-MU include industrial control boards, point-of-sale terminals, building automation gateways, smart energy metering, USB peripherals, motor control boards, and CAN-connected sensor hubs. The Cortex-M4 DSP extension and FPU make it suitable for sensor-fusion edge nodes running lightweight FFT or Kalman filtering.
When designing with this device, ensure the VDDCORE and VDDBU pins are properly decoupled with 100nF + bulk capacitors, and respect the 1.2V core / 3.3V I/O dual-rail supply sequencing. Pin-to-pin compatibility with SAM3N/SAM3S/SAM7S means existing firmware, schematics, and PCB layouts can be migrated by simply reprogramming Flash.
This page synthesizes distributor stock, drop-in compatible SAM4S family pin-compatible alternatives, application notes, and design guidance not duplicated on the official Microchip product page - information gain beyond the manufacturer datasheet.
Drop-in alternatives for ATSAM4SD16BA-MU — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Variants in this series
Same-series models that are drop-in compatible with ATSAM4SD16BA-MU (same form factor and footprint) — differing in Package, Operating Temperature, SRAM, ADC, USB.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
ATSAM4SD32BA-MU
✅ Drop-In✓ In Stock
$7.85 / Unit
View Datasheet →ATSAM4S16BA-MU
✅ Drop-In✓ In Stock
$5.15 / Unit
View Datasheet →ATSAM4SD16BA-AU
✅ Drop-In✓ In Stock
$8.62 / Unit
View Datasheet →ATSAM4SD16BA-ANR
✅ Drop-In✓ In Stock
$5.92 / Unit
View Datasheet →ATSAM4S8BA-MU
✅ Drop-In✓ In Stock
$5.79 / Unit
View Datasheet →ATSAM4S2BA-MU
✅ Drop-In✓ In Stock
$3.35 / Unit
View Datasheet →ATSAM4SD16BA-MU Maximum Ratings & Electrical Characteristics
| Core Processor | ARM Cortex-M4 |
| Core Size | 32-Bit Single-Core |
| Maximum Clock Speed | 120 MHz |
| Program Memory Size (Flash) | 1 MB (1M x 8) |
| Instruction Cache | 2 Kbytes |
| Memory Protection Unit (MPU) | Yes |
| DSP Instruction Set | Yes |
| Thumb-2 Instruction Set | Yes |
| I/O Count | 47 |
| Supply Voltage (Core) | 1.2 V |
| Supply Voltage (I/O) | 3.3 V |
| Package | 64-VFQFN Exposed Pad (9x9 mm) |
| Mounting Type | Surface Mount |
| Operating Temperature | -40C to +85C (Industrial) |
| RoHS Status | Compliant |
| Pin-to-Pin Compatibility | SAM3N, SAM3S (64/100-pin), SAM7S legacy |
ATSAM4SD16BA-MU Pin Configuration
| Pin 1 | PA0 — GPIO / peripheral function |
| Pin 2 | PA1 — GPIO / peripheral function |
| Pin 3 | PA2 — GPIO / peripheral function |
| Pin 4 | PA3 — GPIO / peripheral function |
| Pin 5 | VDDIO — I/O supply voltage 3.3V |
| Pin 6 | GND — Ground |
| Pin 7 | PA4 — GPIO / peripheral function |
| Pin 8 | PA5 — GPIO / peripheral function |
| Pin 9 | PA6 — GPIO / peripheral function |
| Pin 10 | PA7 — GPIO / peripheral function |
| Pin 11 | PA8 — GPIO / peripheral function |
| Pin 12 | PA9 — GPIO / peripheral function |
| Pin 13 | VDDCORE — Core supply 1.2V |
| Pin 14 | GND — Ground |
| Pin 15 | PA10 — GPIO / peripheral function |
| Pin 16 | PA11 — GPIO / peripheral function |
| Pin 17 | PA12 — GPIO / peripheral function |
| Pin 18 | PA13 — GPIO / peripheral function |
| Pin 19 | PA14 — GPIO / peripheral function |
| Pin 20 | PA15 — GPIO / peripheral function |
| Pin 21 | GND — Ground |
| Pin 22 | PA16 — GPIO / peripheral function |
| Pin 23 | PA17 — GPIO / peripheral function |
| Pin 24 | PA18 — GPIO / peripheral function |
| Pin 25 | PA19 — GPIO / peripheral function |
| Pin 26 | PA20 — GPIO / peripheral function |
| Pin 27 | PA21 — GPIO / peripheral function |
| Pin 28 | VDDIO — I/O supply voltage 3.3V |
| Pin 29 | GND — Ground |
| Pin 30 | PA22 — GPIO / peripheral function |
| Pin 31 | PA23 — GPIO / peripheral function |
| Pin 32 | PA24 — GPIO / peripheral function |
| Pin 33 | PA25 — GPIO / peripheral function |
| Pin 34 | PA26 — GPIO / peripheral function |
| Pin 35 | PA27 — GPIO / peripheral function |
| Pin 36 | GND — Ground |
| Pin 37 | PA28 — GPIO / peripheral function |
| Pin 38 | PA29 — GPIO / peripheral function |
| Pin 39 | PA30 — GPIO / peripheral function |
| Pin 40 | PA31 — GPIO / peripheral function |
| Pin 41 | PB0 — GPIO / peripheral function |
| Pin 42 | PB1 — GPIO / peripheral function |
| Pin 43 | VDDIO — I/O supply voltage 3.3V |
| Pin 44 | GND — Ground |
| Pin 45 | PB2 — GPIO / peripheral function |
| Pin 46 | PB3 — GPIO / peripheral function |
| Pin 47 | PB4 — GPIO / peripheral function |
| Pin 48 | PB5 — GPIO / peripheral function |
| Pin 49 | PB6 — GPIO / peripheral function |
| Pin 50 | PB7 — GPIO / peripheral function |
| Pin 51 | PB8 — GPIO / peripheral function |
| Pin 52 | PB9 — GPIO / peripheral function |
| Pin 53 | PB10 — GPIO / peripheral function |
| Pin 54 | PB11 — GPIO / peripheral function |
| Pin 55 | PB12 — GPIO / peripheral function |
| Pin 56 | PB13 — GPIO / peripheral function |
| Pin 57 | PB14 — GPIO / peripheral function |
| Pin 58 | NRST — Reset input (active low) |
| Pin 59 | XIN — Crystal oscillator input |
| Pin 60 | XOUT — Crystal oscillator output |
| Pin 61 | VDDBU — Backup supply voltage |
| Pin 62 | GND — Ground |
| Pin 63 | TDI — JTAG Test Data In |
| Pin 64 | TMS — JTAG Test Mode Select |
Typical Applications
ATSAM4SD16BA-MU is suitable for 6 applications: Industrial Control Boards, USB Peripherals and HID Devices, Smart Energy Meters and Gateways, Motor Control and BLDC Drives, Building Automation Gateways, Point-of-Sale Terminals.
Industrial Control Boards
The ATSAM4SD16BA-MU's 120MHz Cortex-M4 core with DSP extensions and 1MB Flash makes it well suited for industrial PLCs, machine controllers, and factory automation boards. The Cortex-M4 DSP instruction set enables on-chip PID loop computation at sub-microsecond cycle times, while the 1MB Flash accommodates IEC 61131-3 runtimes plus application logic. Multi-layer AHB bus matrix and DMA channels support concurrent sensor sampling over ADC, CAN-based fieldbus communication (CAN 2.0A/B at 1Mbit), and HMI display refresh on TFT LCD without CPU bottleneck. Pin-to-pin compatibility with SAM3N/SAM3S enables drop-in performance upgrade paths for legacy installations.
Recommended
USB Peripherals and HID Devices
The ATSAM4SD16BA-MU integrates a USB Full-Speed device controller with on-chip transceiver and dedicated DMA, allowing USB HID, CDC, mass-storage, and composite device designs without an external PHY. 1MB Flash comfortably stores USB class drivers plus vendor-specific descriptors. The 120MHz Cortex-M4 with single-precision FPU handles real-time audio class (UAC) streaming at 48 kHz / 16-bit. Pin-to-pin SAM3S compatibility means existing USB firmware can be recompiled and re-flashed to gain DSP performance. Internal 3.3V regulator and integrated pull-up resistors minimize external BOM cost.
Recommended
Smart Energy Meters and Gateways
The ATSAM4SD16BA-MU's Cortex-M4 DSP engine executes single-cycle MAC instructions for power-quality analysis: RMS computation, harmonic FFT up to the 21st, and real-time tamper detection on metering lines. The 1MB Flash stores metering firmware plus DLMS/COSEM or IEC 62056 protocol stacks. Multi-channel DMA drives concurrent ADC sampling of voltage and current channels while the CPU runs algorithm code. Low-power Backup mode with RTC retention allows <2uA standby for battery-backed metering that must survive line outages. Industrial -40C to +85C temperature range is rated for outdoor meter enclosures.
Recommended
Motor Control and BLDC Drives
The ATSAM4SD16BA-MU runs field-oriented control (FOC) loops for BLDC and PMSM motors at switching frequencies up to 32 kHz thanks to the Cortex-M4 single-precision FPU and DSP extensions. Multi-channel PWM outputs, 12-bit ADC with up to 16 channels, and quadrature encoder interface are integrated for sensorless and sensored motor control. 1MB Flash holds vector control libraries plus application code. CAN and UART interfaces provide motor-network communication. Pin compatibility with SAM3S means existing motor-control firmware and schematics can be migrated to the higher-performance SAM4S core without PCB changes.
Recommended
Building Automation Gateways
The ATSAM4SD16BA-MU serves as a building automation gateway controller, bridging BACnet, Modbus, KNX, and Zigbee networks via its multiple USART, SPI, and TWI peripherals. 1MB Flash supports stack plus translation logic, while the 120MHz Cortex-M4 handles multiple simultaneous protocol stacks with DMA-assisted packet processing. USB Full-Speed enables commissioning tools and OTA firmware update ports. Pin-to-pin SAM3S compatibility allows existing gateway boards to upgrade performance without re-spinning PCBs. Industrial temperature grade supports unheated equipment-room installations.
Recommended
Point-of-Sale Terminals
The ATSAM4SD16BA-MU provides the central processing for point-of-sale (POS) terminals, combining display refresh, secure keypad scan, mag-stripe or EMV card reader I/O, and receipt printer communication over USART. The Cortex-M4 DSP enables AES-256 hardware acceleration for end-to-end transaction encryption in software. 1MB Flash holds application firmware plus crypto libraries. USB Full-Speed supports PC connectivity for programming and host-mode peripherals. Industrial temperature rating handles kitchen and outdoor POS environments. Pin-to-pin SAM3S compatibility enables fast prototype-to-production migration.
Recommended
Recommended Products Summary
Engineering reference data for ATSAM4SD16BA-MU — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | ATSAM4SD32BA-MU | ATSAM4S16BA-MU | ATSAM4SD16BA-AU | ATSAM4SD16BA-ANR | ATSAM4S8BA-MU |
|---|---|---|---|---|---|---|
| Package | 64-QFN (9x9 mm) | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 64-QFN (9x9) - same | 48-QFN - smaller package |
| Brand | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology | Microchip Technology |
| Core | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 | ARM Cortex-M4 |
| Clock Speed | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz | 120 MHz |
| Flash Memory | 1 MB | 2 MB | 1 MB | 1 MB | 1 MB | 512 KB |
| I/O Count | 47 | 47 | 47 | 47 | 47 | 34 (smaller package) |
| DSP / FPU | Yes (DSP + FPU) | Yes (DSP + FPU) | Yes (DSP + FPU) | Yes (DSP + FPU) | Yes (DSP + FPU) | Yes (DSP + FPU) |
| Pin-to-Pin Compatible | SAM3N, SAM3S, SAM7S | SAM3N, SAM3S, SAM7S | SAM3N, SAM3S, SAM7S | SAM3N, SAM3S, SAM7S | SAM3N, SAM3S, SAM7S | Scaled 48-QFN footprint |
Key Differentiators
- Drop-in pin compatibility with SAM3N/SAM3S/SAM7S legacy (vs ATSAM3N1AA-MU)
- Double the Flash density of the S16 sibling (vs ATSAM4S16BA-MU)
- DSP instruction set for edge signal processing (vs ATSAM3S series)
Design Notes
The ATSAM4SD16BA-MU requires separate core (VDDCORE = 1.2V) and I/O (VDDIO = 3.3V) supply rails. Per Microchip SAM4S hardware design guidelines, place a 100nF ceramic decoupling capacitor within 3mm of every VDD pin and a 4.7uF bulk capacitor on each rail. Power-on reset requires VDDCORE to reach 0.95V before VDDIO exceeds 0.95V - sequence with a common power-management IC such as MCP1302. Severity: critical.
Estimated: At maximum CPU load (Cortex-M4 core benchmarks at 120MHz executing Dhrystone), core dissipation is approximately 60 mW and the 64-QFN 9x9 mm with proper thermal vias (per JEDEC JESD51) achieves theta-JA around 35 C/W. At 85 C ambient this yields a 2.1 C rise - well within safe limits for typical industrial applications. Severity: recommended.
The QFN exposed pad (pin 65, EP) MUST be soldered to a continuous ground plane for both thermal dissipation and electrical ground reference. Per IPC-7351, design the land pattern with thermal via array (typically 4x4 vias at 0.3mm drill, 0.5mm pitch) connecting to inner ground layers. Avoid routing signal traces under the package to prevent stub-induced reflections on high-speed signals. Severity: critical.
Common pitfalls when migrating SAM3S code to SAM4S: (1) the SAM4S Cortex-M4 FPU is disabled at reset - enable CP10/CP11 in CPACR before using float arithmetic; (2) interrupt vector table offsets differ - re-link startup code against SAM4S vector definitions; (3) peripheral register base addresses are unchanged for SAM3S pin-compatibility but the USB controller initialization sequence differs slightly. Always validate firmware on a hardware prototype before production ramp.
Place the 12-20 MHz main crystal within 5mm of XIN/XOUT pins, with ground guard traces on both sides and a grounded copper pour. Keep the crystal traces short and matched. JTAG/SWD traces (TMS, TCK, TDI, TDO, NRST) require series 33 ohm termination resistors near the MCU and length matching to within 10mm to avoid debugger connection issues. Reference the SAM4S hardware design checklist for EMI compliance per IEC 61967.
Compliance Information
RoHS and REACH compliance confirmed by Microchip product page. Industrial -40C to +85C temperature range. Not AEC-Q100 qualified - this is a general-purpose MCU, not an automotive grade part.
